Webpage HTTP performance
Yahoo developers have encapsulated much of their experience in optimizing web sites and serving web pages in a Firefox add-in. It is called YSlow, I've been having decent success in analyzing pages using it as of late. It is simple and effective, a great little tool. Not everything is easily achievable and depending on the content you are delivering it might not be reasonable. In the end, I've been able to use it and spend a short amount of time to identify a number of changes needed for more rapid delivery of HTTP content.
Download it, install it, try it ...
YSlow
Keywords: website performance, analyzing website performance, analyzing http performance, http performance, speed up web page delivery